[gdal-dev] layer union returns a geometry collection

[jratike80]

Matthew Snape wrote
> Hello,
> 
> I am performing a union of two layers using OGR from Python...
> 
> layerA.Union(layerB, layerC,["PROMOTE_TO_MULTI=YES",])
> 
> This returns a layer composed of multipolygon's  except for a single
> geometrycollection in the form...
> 
> GEOMETRYCOLLECTION (POINT (2610469.66 3325023.52),POLYGON ((2610439.3657
> 3325014.925899999..........
> 
> Is this expected behaviour, and if so what is it showing?
> 
> Any help appreciated
> Thank you.
> 
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Hi,

It would help a lot if you could find out and extract those source features
which make up that geometrycollection. Otherwise it is quite impossible to
answer.

-Jukka Rahkonen-



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